Many of you will laugh at this, but I find this name to be masculine in sound. I think it only works in the culture it comes from, as people from the US and Canada, for instance, would surely think it's masculine, short for Bronson or something.
I've never known or known about an Afrikaans person with the name "Bron". It is a word, and it does mean "source", like the source of a river as well as figuratively, but I'd like to see a reference.Bronson is sometimes used as a male name in South Africa. But, once again, never by an Afrikaans person as far as I know.